subdf3.c revision 321369
1//===-- lib/adddf3.c - Double-precision subtraction ---------------*- C -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements double-precision soft-float subtraction with the 11// IEEE-754 default rounding (to nearest, ties to even). 12// 13//===----------------------------------------------------------------------===// 14 15#define DOUBLE_PRECISION 16#include "fp_lib.h" 17 18// Subtraction; flip the sign bit of b and add. 19COMPILER_RT_ABI fp_t 20__subdf3(fp_t a, fp_t b) { 21 return __adddf3(a, fromRep(toRep(b) ^ signBit)); 22} 23 24#if defined(__ARM_EABI__) 25AEABI_RTABI fp_t __aeabi_dsub(fp_t a, fp_t b) { 26 return __subdf3(a, b); 27} 28#endif 29 30